Operation not permited

Triying to conect to a file sharing from a Mac Pro but the system get me the mesage " Operation not Permited"

I star the sharing from the Mac Pro, but when to try to find in the libreelec OS give the error

here the URL Log

http://ix.io/1hf4

I test with ping between the Mac and the TV Box and the response was good.

but when I try to configure to access the file sharing from the MAC give the error " Operation no permited"

can some body help me?

thanks